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The United States has the world's largest network of highways, including both the Interstate Highway System and the US Highway System.
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At least one of these networks is present in every state and they interconnect most major cities.
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China's highway network is the second most extensive in the world, with a total length of about 3.573 million km.
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China's expressway network is also the second longest in the world, and it is quickly expanding, stretching some 85,000 km at the end of 2011.
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The Pan-American Highway is longest international highway, which connects many countries in the Americas.
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It stretches across a distance of nearly 47,000 kilometres.
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Australia's Highway 1 is a network of highways that circumnavigate the Australian continent, joining all mainland state capitals.
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At a total length of approximately 14,500 km (9,000 mi) it is the longest national highway in the world.
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The United States has the largest national highway system.
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It has around 6,430,366 kilometres of highways.
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The Highway 401 in Ontario, Canada has the busiest highway.
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The 400-series highway stretches 817.9 kilometres from Windsor to the Quebec border.
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The Katy Freeway (part of Interstate 10) in Houston, Texas, has the widest highway (maximum number of lanes).
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This section was widened in 2008 to include a total of 26 lanes.
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Interstate 5 along a 2-mile section between Interstate 805 and California State Route 56 in San Diego is widest highway, with maximum number of through lanes.
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Completed in April 2007, it is 22 lanes wide.
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The Karakoram Highway, between Pakistan and China, at an altitude of 15,397 ft is the highest international highway.